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- W1989637062 abstract "In order to test the hypothesis that the property of resistance to cytotoxicity is an acquired trait of premalignant oral mucosal epithelium, cell dissociates were prepared from in vivo initiated hamster buccal pouch epitheliuin (HBPE), non-initiated HBPE and malignant HIBPE cell lines. These cell types were evaluated for resistance to the cytotoxic effects of the inducing carcinogen, 7,12-dimethylbenz[a]anthracene (DMIBA). A mitoinhibition assay and a clonogerncity assay were used to assess the ability of these cells to replicate or form colonies in the presence of 40 μM DMBA. Replication of primary plated HEPE cells was inhibited by 100% in both assays. PO II, a cell line derived from non-initiated, paraffin-oil-exposed HIBPE, was inhibited by 97 and 100% in the mitoinhibition and colony-forming assays respectively. This same cell line, like primary plated IH{BPE, lacked the transformation-linked traits of angiogenesis and anchorage-independent growth. By contrast, three malignant HEPE cell lines, two derived during long-term culture of DMBA-initiated I-IIBPE, and one from a DM1BA-induced HBPE cacinoma, were inhibited by only 34% or less in the assays for resistance to cytotoxicity. Primary cell cultures derived from HBPE initiated in vivo with twice-weeldy topical applications of a 0.5% solution of DMBA in paraffin oil, for 3 or 5 weeks, were inhibited to an intermediate degree, indicating the presence of DMBA-resistant cells. In addition, DMIBA-resistant cell colonies were observed in cell cultures prepared at 2, 6 and 10 weeks after completing the 5 week initiation regimen. Progenitors of the resistant cells, persisting in vivo for several weeks after initiation, may represent early preneoplastic cell populations in this experimental model." @default.
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- W1989637062 date "1991-01-01" @default.
- W1989637062 modified "2023-09-26" @default.
- W1989637062 title "Resistant keratinocytes in 7,12-dimethylbenz[a]anthracene-initiated hamster buccal pouch epithelium" @default.
- W1989637062 doi "https://doi.org/10.1093/carcin/12.4.617" @default.
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